TWI596994B - Tear-resistant structure of the flexible circuit board - Google Patents

Description

Tamper resistant structure of flexible circuit board

The invention is a structural design of a flexible circuit board, in particular a tearproof structure of a flexible circuit board.

In various electronic devices used today, since the amount of signal line transmission is increasing, more and more signal transmission lines are required. In the signal transmission line technology, the flexible circuit board is the most developed technology at present, and the flexible circuit board has the characteristics of light weight and small volume, and is mainly used to meet the assembly conditions of various external type system products to improve the wiring density characteristics. As a circuit carrier for signal connection or component assembly, since the flexible circuit board can be connected to active, passive or module components, the soft board is also mechanical.

Conventional flexible boards make tear-proof holes at the ends of the wiring, preventing the cutting lines of the flexible circuit board from tearing due to pulling, folding, passing through the shaft holes or maintenance operations. Since the conventional flexible circuit board is simple in wiring, the line-to-line spacing is large enough to make a tear-proof hole with a large circle, preventing the cutting line of the flexible circuit board from being torn due to pulling or folding.

With the improvement of the current technology, the wiring complexity of the flexible circuit board is relatively high, resulting in a small line-to-line spacing. The conventional tear-proof hole design greatly affects the wiring of the flexible circuit board, so how to not affect the wiring The limited space prevents the cutting line of the flexible circuit board from tearing due to pulling, folding, passing through the shaft hole or maintenance operation. To solve the above-mentioned shortcomings of the prior art, that is, the subject of research and development that is relevant to those engaged in this industry.

Accordingly, it is an object of the present invention to provide a tear-proof junction of a flexible circuit board. Forming at least one cutting line in the extending section by a flexible circuit board in a limited space that does not affect the wiring, the end of the cutting line extending a stress guiding cutting section to prevent the cutting line of the flexible circuit board from being pulled or folded There is a tear.

The technical means adopted by the present invention to solve the problems of the prior art is that at least one cutting line is formed in an extended section of a flexible circuit board, and a stress guiding cutting section is extended at at least one end of the cutting line. The cutting direction of the guiding cutting section is at an angular difference from the extending direction as a tear-proof structure of the flexible circuit board.

The stress guiding cutting section of the flexible circuit board may be in the shape of a straight line, an arc, or an S shape, or may be further connected to form a tear preventing hole at the terminating end of the stress guiding cutting section, the tearing hole serving as a stress resistance Absolute structure, and effectively strengthen the anti-tear effect.

Wherein the outer edge of the flexible circuit board corresponds to the cutting line, and a recess is formed, and the extended section of the flexible circuit board further folds the flexible circuit board along the cutting line and the recess. Wherein the extended section of the flexible circuit board is further wound by a spiral member or a bundle member.

The flexible circuit board can be one of a soft flat cable (FFC) and a flexible printed circuit board (FPC).

In terms of efficacy, the present invention guides the cutting segment by stress, so that the stress-oriented cutting segment conforms to the wiring in a case where the wiring complexity of the flexible circuit board is high and the line-to-line spacing is small and the wiring is not affected. The path and the direction of the angle are changed to prevent the cutting line of the flexible circuit board from being torn due to pulling, folding, passing through the shaft hole or maintenance operation.

The specific embodiments of the present invention will be further described by the following examples and the accompanying drawings.

100‧‧‧Soft circuit board

101‧‧‧First connection section

102‧‧‧Second connection section

103‧‧‧Extended section

1‧‧‧ wire

11‧‧‧Differential signal line

12‧‧‧Differential signal line

2‧‧‧ cutting line

End of 21‧‧‧

22‧‧‧stress-oriented cutting section

23‧‧‧ recess

24‧‧‧ solder pads

25‧‧‧Electronic components

26‧‧‧welding feet

3‧‧‧Electronic devices

31‧‧‧Shaft members

32‧‧‧Axis hole

4‧‧‧Spiral components

5‧‧‧Anti-corruption hole

6‧‧‧Arc-shaped stress-oriented cutting section

7‧‧‧S-shaped stress-oriented cutting section

P‧‧‧ signal pin

M‧‧‧ extending direction

Θ‧‧‧angle difference

Figure 1 shows a schematic view of a first embodiment of the invention.

Figure 2 shows a partial enlarged view of Figure 1.

Figure 3 shows a partially enlarged perspective view of Figure 1.

Figure 4 shows a schematic diagram of the flexible circuit board being folded during application.

Figure 5 shows a schematic view of a helical member bundle in an extended section of a flexible circuit board.

Figure 6 shows a schematic view of a bundle of bundle members in an extended section of a flexible circuit board.

Figure 7 is a schematic illustration of the axial section of the extension member of the flexible circuit board through the hinge member of an electronic device.

FIG. 8 shows a schematic diagram of a plurality of solder pads disposed on one end of the flexible circuit board for solder joints of the electronic components.

Figure 9 is a schematic view showing a second embodiment of the present invention.

Fig. 10 is a view showing a third embodiment of the present invention.

Figure 11 is a view showing a fourth embodiment of the present invention.

Please refer to FIG. 1 and FIG. 2, wherein FIG. 1 is a schematic view showing a first embodiment of the present invention, and FIG. 2 is a partially enlarged schematic view of FIG. As shown, a flexible circuit board 100 includes a first connection section 101, a second connection section 102, and an extension connected between the first connection section 101 and the second connection section 102. In the segment 103, the extension section 103 extends in an extending direction M.

The extending section 103 includes a plurality of wires 1 extending in an extending direction M, and the wires 1 are respectively connected to corresponding signal pins P disposed at the first end and the second end. The wire 1 may include a power line, a ground line, and a signal line, and may also include at least one pair of differential mode signal lines 11 and 12 disposed to carry the differential mode signal.

Referring to FIG. 3, at least one cutting line 2 is formed in the extending section 103. The cutting line 2 extends along the extending direction M, and a distal end 21 is formed at each end of the cutting line 2. The outer edge of the flexible circuit board 100 corresponds to the cutting line 2 At the same time, a recess 23 is formed.

In the design of the present invention, the at least one end 21 of the cutting line 2 of the flexible circuit board 100 extends with a stress guiding cutting section 22, and the cutting direction of the stress guiding cutting section 22 is formed between the extending direction M and the extending direction M. The angle difference θ and the stress guiding cutting section 22 are cut off at a terminating end, and the stress guiding cutting section 22 serves as a tear preventing structure of the flexible circuit board 100.

Referring to FIG. 4, in the actual application, the extending section 103 can be folded by using the cutting line 2 and the recess 23 as a fold line, so that the width of the extending section 103 can be reduced, so as to reduce the extension when the circuit is wired. Section 103 is the space occupied by the circuit design.

When the cutting line 2 of the flexible circuit board 100 is subjected to folding operation, being pulled, or during product production, stress is guided by the stress guiding cutting section 22. Without the design of the stress-directed cutting section 22, it is easy for the end 21 of the cutting line 2 to form a stress concentration point and be directly torn.

Referring to FIG. 5, after the flexible circuit board 100 is folded along the cutting line 2, it may be further wound by a spiral member 4 in the extended section 103 of the flexible circuit board 100 or wound by a winding member 41. (As shown in Figure 6), to facilitate the entire line.

Referring to FIG. 7, after the extending portion 103 of the flexible circuit board 100 is wound by the spiral member 4 or the winding member 41, the extending portion 103 can be passed through the shaft hole 32 or the shaft member 31 of the electronic device 3. The narrow hole of the mechanism.

In the foregoing embodiment, the first connecting section 101 and the second connecting section 102 at both ends of the flexible circuit board 100 are provided with a signal pin P as a legend. Of course, as shown in FIG. 8, in the first connecting section. A plurality of pads 24 are disposed between one or both of the second connecting sections 102 for soldering the soldering legs 26 of an electronic component 25 to the corresponding pads 24.

Please refer to FIG. 9, which shows a schematic diagram of a second embodiment of the present invention. A tear-proof hole 5 is formed in the end of the stress-directed cutting section 22 to be more communicated. When the cutting line 2 of the flexible circuit board 100 is subjected to folding operation, being pulled, or during production of the product, the stress may be guided by the stress guiding cutting section 22, and the tearing hole 5 may be used. As a stress-resisting structure, it effectively enhances the effect of tear prevention.

The stress guiding cutting segments 22 shown in the previous embodiments are in a straight line, and the linear type of stress guiding cutting segments 22 extend along the area between two adjacent wires 1. The stress-oriented cutting section 22 can also be in other structural forms. For example, in the third embodiment of the present invention shown in FIG. 10, an arc-shaped stress-oriented cutting is extended at the at least one end 21 of the cutting line 2 of the flexible circuit board 100. The segment 6 can also serve as a tear-resistant structure of the flexible circuit board 100.

In the fourth embodiment of the present invention shown in FIG. 11, a S-shaped stress guiding cutting section 7 extends from the at least one end 21 of the cutting line 2 of the flexible circuit board 100, and can also serve as a tear-proof of the flexible circuit board 100. Split structure.

The above-mentioned embodiments are only intended to illustrate the invention, and are not intended to limit the scope of the invention, and other equivalent modifications or substitutions which are not departing from the spirit of the invention are intended to be included in the scope of the appended claims. Inside.

100‧‧‧Soft circuit board

101‧‧‧First connection section

102‧‧‧Second connection section

103‧‧‧Extended section

1‧‧‧ wire

2‧‧‧ cutting line

End of 21‧‧‧

22‧‧‧stress-oriented cutting section

23‧‧‧ recess

P‧‧‧ signal pin

M‧‧‧ extending direction

Claims (11)

A rip-proof structure of a flexible circuit board includes a first connecting section, a second connecting section, and a connection between the first connecting section and the second connecting section on a flexible circuit board An extension section extending in an extending direction, the extension section including a plurality of wires extending in the extending direction, and at least one cutting line is formed in the extending section, the cutting line is along the Extending in an extending direction, and forming an end at each end of the cutting line, wherein at least one end of the cutting line of the flexible circuit board extends with a stress guiding cutting section, the stress guiding cutting of the cutting section An angle difference between the direction of the extending direction and the extending direction of the extending section, and the stress guiding cutting section is cut off at a terminating end, the extending section is passed through a shaft hole of a rotating shaft member, and the stress guiding cutting section is used as The tearproof structure of the flexible circuit board. The ripstop structure of the flexible circuit board according to claim 1, wherein the stress guiding cutting section is one of a linear stress guiding cutting section, an arc stress guiding cutting section, and an S-shaped stress guiding cutting section. The rip-proof structure of the flexible circuit board according to the first aspect of the invention, wherein the outer edge of the flexible circuit board corresponds to the cutting line, and a recess is further formed. The rip-proof structure of the flexible circuit board of claim 3, wherein the extended section of the flexible circuit board further folds the flexible circuit board along the cutting line and the recess. The ripstop structure of the flexible circuit board of claim 1, wherein the extended section of the flexible circuit board is further wound by a spiral member. The rip-proof structure of the flexible circuit board of claim 1, wherein the extended section of the flexible circuit board is further wound by a bundle member. The ripstop structure of the flexible circuit board according to claim 1, wherein the The flexible circuit board is one of a soft flat cable (FFC) and a flexible printed circuit board (FPC). The ripstop structure of the flexible circuit board of claim 1, wherein the end of the stress guiding cutting section is further connected to form a tear preventing hole. The ripstop structure of the flexible circuit board of claim 1, wherein the wire comprises at least one pair of differential mode signal lines for carrying a differential mode signal. The rip-proof structure of the flexible circuit board of claim 1, wherein the first connecting section and the second connecting section of the flexible circuit board are provided with a plurality of signal pins. The rip-proof structure of the flexible circuit board of claim 1, wherein the first connecting section and the second connecting section of the flexible circuit board are provided with a plurality of pads.